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Asia has the largest population in the world at approximately 4.2 billion people, which makes up more than half of the approximately 7 billion people on the planet. Asia contains both of the two most populated countries: China and India. China has a population of over 1.3 billion people, while India has a population of about 1.2 billion. The next biggest country in the world is the United States, which has a considerably lower population of just over 300 million people.

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For the vast majority of individuals on the planet, about 0.27 percent of the world's population shares their birthday. There is an equal chance of anyone being born on any day of the year. So the odds of someone sharing your birthday are 1 in 365.

Numerous factors constrain population growth, most notably high mortality rates, low fecundity, mass emigration and low immigration. Environmental factors like disease and resource scarcity play a major role. Other factors are social, political and economic in nature.

The most authoritative resource on the world's birth trends is the much cited WHO Global health situation, with trends spanning from 1955 to 2025. The site was published in 1998. The report estimates that in 1997 there were 365,000 babies born each day. That equates to 253.5 babies per minute.